Trussed ladder



(NoMoael.)

P. S. SEAGRAVE.

TRUSSBD m1313818.Y Y

180.287.808. Patented NQV.2`1,`1882.'

UNITED STATES PATENT OFFICE.

FREDERIC S. SEAGRAVE, OF ROCHESTER, MICHIGAN.

TRUSSED LADDER.

SPECIFICATION forming part of Letters `IEateni', No. 267,803, datedNovember .21, 1882. Application filed April 13, 1882; (No model.) a

To all whom it may concern Be it known that I, FREDERIC S. SEA- GRAVE,of Rochester, in the county of Oakland and State of Michigan, haveinvented new and -useful Improvements in Trussed Ladders; and

I do hereby declare that the followingis a full, clear, and exactdescription thereof', reference being had to the accompanyingdrawing,which forms a part of this specification.

The nature of this invention relates to certain new and usefulimprovements in the construction ot' ladders, by means of whichdeflection, by the imposed weight upon the ladder is avoided as well asall tendency to lateral swaying.

The invention consists in so trussing a ladder as to prevent deflectionby the superimposed weight and side or lateral swaying of the latter.Ladders of extraordinary length have been-trussed heretofore by adistinct and separate truss upon each leg of the ladder. Such trussingwould to a very large degree prevent deflection; but under nocircumstances would it have any eli'ect upon theV lateral or side-swaying motion of the ladder when in use.

The object of my invention, therefore, is to overcome both thesedifficulties.

In the accompanying drawing, my invention is shown in a perspectiveelevation, taken from the rear. A A' represent the two legs ot' theladder, provided with the usual rounds, B. Midway between the ends ofthe legs is rigidly attached or secured the bridge C, made in an archedform, substantially as shown. Atruss-` rod, D, is secured at each endnear the ends of the leg A, and leads to a central point on the rear ofsaid bridge. A similar truss, E, is similarly secured to the leg A', andat the centrai point of meeting of these two trusses upon the brid gethey are secured thereto in this manner, the two truss-rods formin g atruss which prevents the ordinary deiiection of the ladder, and as thetruss-rods run from this given center outwardly and radially to the endsof the legs of the ladder all tendency to side sway or rocking motion isavoided.

What I claim as myinvention is- The combination, with the legs A A of aladder, of the central cross-bar, C, and the truss-rods D E, eachsecured at its ends to opposite ends of the legs, and both secured attheir middle to the center of the cross-bar (l, substantially asdescribed.

FREDERIC s. sEAenAvE.

Witn esses H. S. SPRAGUE, E. ScULLY.

